Gemini Mcp

io.github.chrischall/gemini-mcp · v2.5.1

Generate and edit images with Google Gemini (Nano Banana / Nano Banana Pro) image models.

Source code Set it up

Connect Runs on your machine

Terminal

claude mcp add gemini-mcp -e GEMINI_API_KEY=<GEMINI_API_KEY> -e GEMINI_IMAGE_MODEL=<GEMINI_IMAGE_MODEL> -e GEMINI_OUTPUT_DIR=<GEMINI_OUTPUT_DIR> -e GEMINI_INPUT_DIR=<GEMINI_INPUT_DIR> -e GEMINI_UPLOAD_DIR=<GEMINI_UPLOAD_DIR> -e GEMINI_REFERENCE_DIR=<GEMINI_REFERENCE_DIR> -e GEMINI_TIMEOUT_MS=<GEMINI_TIMEOUT_MS> -e GEMINI_HEARTBEAT_MS=<GEMINI_HEARTBEAT_MS> -e GEMINI_CHAIN_RETRY_MS=<GEMINI_CHAIN_RETRY_MS> -e GEMINI_DEBUG=<GEMINI_DEBUG> -e GEMINI_RATE_CARD=<GEMINI_RATE_CARD> -- npx -y @chrischall/[email protected]

claude_desktop_config.json

{
  "mcpServers": {
    "gemini-mcp": {
      "command": "npx",
      "args": [
        "-y",
        "@chrischall/[email protected]"
      ],
      "env": {
        "GEMINI_API_KEY": "<GEMINI_API_KEY>",
        "GEMINI_IMAGE_MODEL": "<GEMINI_IMAGE_MODEL>",
        "GEMINI_OUTPUT_DIR": "<GEMINI_OUTPUT_DIR>",
        "GEMINI_INPUT_DIR": "<GEMINI_INPUT_DIR>",
        "GEMINI_UPLOAD_DIR": "<GEMINI_UPLOAD_DIR>",
        "GEMINI_REFERENCE_DIR": "<GEMINI_REFERENCE_DIR>",
        "GEMINI_TIMEOUT_MS": "<GEMINI_TIMEOUT_MS>",
        "GEMINI_HEARTBEAT_MS": "<GEMINI_HEARTBEAT_MS>",
        "GEMINI_CHAIN_RETRY_MS": "<GEMINI_CHAIN_RETRY_MS>",
        "GEMINI_DEBUG": "<GEMINI_DEBUG>",
        "GEMINI_RATE_CARD": "<GEMINI_RATE_CARD>"
      }
    }
  }
}

~/.cursor/mcp.json

{
  "mcpServers": {
    "gemini-mcp": {
      "command": "npx",
      "args": [
        "-y",
        "@chrischall/[email protected]"
      ],
      "env": {
        "GEMINI_API_KEY": "<GEMINI_API_KEY>",
        "GEMINI_IMAGE_MODEL": "<GEMINI_IMAGE_MODEL>",
        "GEMINI_OUTPUT_DIR": "<GEMINI_OUTPUT_DIR>",
        "GEMINI_INPUT_DIR": "<GEMINI_INPUT_DIR>",
        "GEMINI_UPLOAD_DIR": "<GEMINI_UPLOAD_DIR>",
        "GEMINI_REFERENCE_DIR": "<GEMINI_REFERENCE_DIR>",
        "GEMINI_TIMEOUT_MS": "<GEMINI_TIMEOUT_MS>",
        "GEMINI_HEARTBEAT_MS": "<GEMINI_HEARTBEAT_MS>",
        "GEMINI_CHAIN_RETRY_MS": "<GEMINI_CHAIN_RETRY_MS>",
        "GEMINI_DEBUG": "<GEMINI_DEBUG>",
        "GEMINI_RATE_CARD": "<GEMINI_RATE_CARD>"
      }
    }
  }
}

.vscode/mcp.json

{
  "servers": {
    "gemini-mcp": {
      "type": "stdio",
      "command": "npx",
      "args": [
        "-y",
        "@chrischall/[email protected]"
      ],
      "env": {
        "GEMINI_API_KEY": "<GEMINI_API_KEY>",
        "GEMINI_IMAGE_MODEL": "<GEMINI_IMAGE_MODEL>",
        "GEMINI_OUTPUT_DIR": "<GEMINI_OUTPUT_DIR>",
        "GEMINI_INPUT_DIR": "<GEMINI_INPUT_DIR>",
        "GEMINI_UPLOAD_DIR": "<GEMINI_UPLOAD_DIR>",
        "GEMINI_REFERENCE_DIR": "<GEMINI_REFERENCE_DIR>",
        "GEMINI_TIMEOUT_MS": "<GEMINI_TIMEOUT_MS>",
        "GEMINI_HEARTBEAT_MS": "<GEMINI_HEARTBEAT_MS>",
        "GEMINI_CHAIN_RETRY_MS": "<GEMINI_CHAIN_RETRY_MS>",
        "GEMINI_DEBUG": "<GEMINI_DEBUG>",
        "GEMINI_RATE_CARD": "<GEMINI_RATE_CARD>"
      }
    }
  }
}

Replace the values in angle brackets with your own. Keys stay on your machine; we never see them.

Tools

This server runs locally, so its tools are listed by your MCP client once it starts.

Environment variables

Name	Description
`GEMINI_API_KEY` Optional, secret	Your Google Gemini API key (aistudio.google.com/apikey)
`GEMINI_IMAGE_MODEL` Optional	Override the default image model (default: gemini-nano-banana-2.1)
`GEMINI_OUTPUT_DIR` Optional	Default directory for generated images (default: ~/Downloads/gemini-mcp). When set, a per-call output_dir must be inside it.
`GEMINI_INPUT_DIR` Optional	Directory to resolve bare input-image filenames against
`GEMINI_UPLOAD_DIR` Optional	Restrict local-file uploads to the Gemini Files API to these directories (path.delimiter-separated; unset = unrestricted)
`GEMINI_REFERENCE_DIR` Optional	Restrict local reference images (images / image paths sent to Gemini) to these directories (path.delimiter-separated), plus GEMINI_OUTPUT_DIR. Unset: GEMINI_UPLOAD_DIR applies; if that is unset too, unrestricted locally, and $MCP_DATA_DIR/uploads when MCP_DATA_DIR is set (hosted)
`GEMINI_TIMEOUT_MS` Optional	Upstream request timeout in ms (default: 60000, or 120000 for image_size: "4K"); each generation tool also takes a per-call timeout_ms
`GEMINI_HEARTBEAT_MS` Optional	Progress-notification cadence in ms while a generation runs (default: 10000; 0 disables) — keeps MCP hosts that reset their timeout on progress from timing out long generations
`GEMINI_CHAIN_RETRY_MS` Optional	How long to wait out interactions-store lag when a chained call 404s (default: 120000; 0 disables retrying)
`GEMINI_DEBUG` Optional	When set, emit heartbeat diagnostics to stderr. Off by default.
`GEMINI_RATE_CARD` Optional	Override/extend the shipped USD-per-1M-token rates used by gemini_token_usage's cost estimate, e.g. {"gemini-3-pro-image":{"input":2,"text_output":12,"image_output":120}}. Malformed JSON is ignored (a bad card must not fail generations).

Details

Package	`@chrischall/[email protected]` (NPM, stdio)
First published	7 Nov 2026
Last updated	7 Nov 2026
Registry name	`io.github.chrischall/gemini-mcp`

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